vsock device fails with "qemu-system-x86_64: vhost_set_features failed: Operation not supported (95)" when queue_reset=true
Host environment
- Operating system: Fedora 37 (also occurs with Fedora 36)
- OS/kernel version: Linux yekko 6.0.8-300.fc37.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Nov 11 15:09:04 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
- Architecture: x86_64
- QEMU flavor: qemu-system-x86_64
- QEMU version: built from commit 2c831124
- QEMU command line:
qemu-system-x86_64 -m 2048 -kernel /boot/vmlinuz-6.0.8-300.fc37.x86_64 -initrd mbuto.img -nographic -serial stdio -nodefaults -append "console=ttyS0" -device vhost-vsock-pci,guest-cid=31415,queue_reset=true
Emulated/Virtualized environment
- Operating system: Minimal initramfs built from host using mbuto. Includes vsock driver, and an init script starting
socat
to listen on a vsock and startsshd -i
- OS/kernel version: Same as host
- Architecture: x86_64
Description of problem
Immediately after guest vsock driver initialize, qemu prints error messages. I'm not able to connect to the guest with vsock:
[ 0.654463] Run /init as init process
[ 0.679778] NET: Registered PF_VSOCK protocol family
qemu-system-x86_64: vhost_set_features failed: Operation not supported (95)
qemu-system-x86_64: Error starting vhost: 95
ssh-keygen: generating new host keys: RSA DSA ECDSA ED25519
#
Steps to reproduce
- Clone
git://passt.top/passt
- In
passt/test
, runmake mbuto.img
- Run
qemu-system-x86_64 -enable-kvm -m 2048 -kernel KERNEL -initrd mbuto.img -nographic -serial stdio -nodefaults -append "console=ttyS0" -device vhost-vsock-pci,guest-cid=31415,queue_reset=true
replacing KERNEL with the host kernel image.
Additional information
- Problem goes away if
queue_reset=false
, which means it goes away with default options prior to69e1c14aa222
("virtio: core: vq reset feature negotation support") - Occurs both with and without KVM
Edited by dgibson